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The mystery of Malaysia Airlines Flight 370 appeared to deepen as reports emerged that passengers' cell phones continued to ring long after the flight went missing Saturday.

After the torment of not knowing what has happened to their loved ones, relatives of MH370 passengers had resorted to calling their phones, and were greeted with ringtones.

The aircraft disappeared unexpectedly from tracking early Saturday. No distress call from the pilots was received, and search efforts to date have not yielded any conclusive results, only adding to the uncertainty surrounding the fate of the Beijing-bound flight.

Speculation quickly mounted on social media that these "phantom calls" amounted to evidence that the flight had not crashed, as has been widely assumed.

"Frustrated! ... There are reports from family members that phone calls to their missing loved ones have 'rung through,' indicating the phones aren't on the bottom of the ocean," one Facebook user surmised.